Man pages matching name groff_font in section 5:

groff_font.5.en	debian 10 / groff
groff_font.5.ja	debian 10 / manpages-ja
groff_font.5.en	debian 11 / groff
groff_font.5.ja	debian 11 / manpages-ja
groff_font.5.en	debian 12 / groff
groff_font.5.ja	debian 12 / manpages-ja